chore: 初始版本提交 - 简化架构 + 轮询改造

- 移除 Motia Streams 实时通信，改用 3 秒轮询
- 简化前端代码，移除冗余组件
- 简化后端架构，准备 FastAPI 重构
- 更新 pixi.toml 环境配置
- 保留 bttoxin_digger_v5_repro 作为参考文档

Co-Authored-By: Claude <noreply@anthropic.com>

bttoxin_digger_v5_repro/run_digger_pixi.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [[ $# -lt 2 ]]; then
+  echo "Usage: $0 <input_dir> <scaf_suffix> [threads] [bttoxin_db_dir]"
+  echo "Example: $0 /home/zly/project/bttoxin-pipeline/tests/test_data .fna 4"
+  echo "Example with external DB: $0 /home/zly/project/bttoxin-pipeline/tests/test_data .fna 4 /home/zly/project/bttoxin-pipeline/external_dbs/bt_toxin"
+  exit 1
+fi
+
+input_dir="$1"
+scaf_suffix="$2"
+threads="${3:-4}"
+bttoxin_db_dir="${4:-}"
+
+cache_dir="$(pwd)/.rattler-cache"
+mkdir -p "$cache_dir"
+if [[ -n "$bttoxin_db_dir" ]]; then
+  if [[ -d "$bttoxin_db_dir" ]]; then
+    env_bin="$(RATTLER_CACHE_DIR="$cache_dir" pixi run which BtToxin_Digger | xargs dirname)"
+    ln -sfn "$bttoxin_db_dir" "$env_bin/BTTCMP_db/bt_toxin"
+  else
+    echo "[warn] bttoxin_db_dir not found: $bttoxin_db_dir" >&2
+  fi
+fi
+RATTLER_CACHE_DIR="$cache_dir" pixi run BtToxin_Digger \
+  --SeqPath "$input_dir" \
+  --SequenceType nucl \
+  --Scaf_suffix "$scaf_suffix" \
+  --threads "$threads"